Rephrase tempConversion instructions

- keep only main instructions above code sample (and move explanation about `module.exports` after the example)
- clarify that results should be rounded to one decimal place (as assume by tests)

tempConversion/README.md

@@ -1,14 +1,17 @@
 # Exercise 06 - tempConversion
 
-This exercise asks you to create more than one function so the module.exports section of the spec file looks a little different this time.  Nothing to worry about, we're just packaging the functions into an object to be exported.
+Write two functions that convert temperatures from Fahrenheit to Celsius, and vice versa:
-
-Write two functions that convert temperatures from Fahrenheit to Celsius (and the other way around):
 ```
 ftoc(32) // fahrenheit to celsius, should return 0
 
 ctof(0) // celsius to fahrenheit, should return 32
 ```
 
+Because we are human, we want the result temperature to be rounded to one decimal place: i.e., `ftoc(100)` should return `37.8` and not `37.77777777777778`.
+
+This exercise asks you to create more than one function so the `module.exports` section of the spec file looks a little different this time.  Nothing to worry about, we're just packaging both functions into a single object to be exported.
 
 ## hints
-The math here is fairly straightforward.. just google the formula and implement it in the code
+- You can find the relevant formulae on [Wikipedia](https://en.wikipedia.org/wiki/Conversion_of_units_of_temperature).
+
+- Try to find by yourself on the Internet how to round a number to 1 decimal place in JavaScript. If you struggle, have a look [here](https://stackoverflow.com/q/7342957/5433628).